Here is the full list of all 101 Little hidden city achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
start the game
the end of the game
find pointer
find statue
find basketball
find cat
find wheelchair
find solar_battery
find flower_palicious
find satellite_talk
find bicycle
find electric car
find power station
find camera
find inflatable pool
find tractor
find medical bed
find water_motocycle
find gazebo
find telescope
find sculpture_rock
find slide
find air conditioning
find motorcycle
find football_ball
find swing
find boat_old
find TV
find traffic light
find VOLGA
complete a level gas station
find part of the train
find haystack
find strut
find wheel_2
find barrel
find engine
find spare part
find wheel
find army trailer
find hovel
find muffler
find logs
find soona
find canister_2
find extinguisher
find old car
find equipment for garage
find canister
find Jack
pass_level_supermarket
find eggplants
find sink
find trolley
find handbag_female
find bananas
find moped
find drawer
find jacket
find soft toy
find bucket_washing brush
find steak_sibs
find cake_shocolate
find fish
find stool
find carton
find shoe
find bank_register
find pac_products
find watermelon
find basket
pass_level_country house
find watering can
find log
find stairs
find light
find bucket of apples
find plant_in_roof
find potty
find Boots
find tools
find watering can_2
pass_level_busstation
find stroller
find bicycle_old
find bottles
find shoes
find newspaper
find suitcase_opened
find suitcase_02
find nameplate
pass_level_apartment
find tube
find book
find coat
find strap
find umbrella
find suitcase
find bag
find hat
find magnifying_glass